Sergey Lavrov

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Russian Foreign Minister Sergey Lavrov, left, and US Secretary of State John Kerry shake hands prior to a meeting at Winfield House in London, Friday March 14, 2014. U.S. Secretary of State John Kerry flew to London on Friday to meet with Russian Foreign Minister Sergey Lavrov in a last-minute bid to stave off a new chapter in the East-West crisis over Ukraine. (AP Photo/Sean Dempsey, Pool)

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Russian Foreign Minister Sergey Lavrov, left, and US Secretary of State John Kerry stand together prior to a meeting at Winfield House in London, Friday March 14, 2014. U.S. Secretary of State John Kerry flew to London on Friday to meet with Russian Foreign Minister Sergey Lavrov in a last-minute bid to stave off a new chapter in the East-West crisis over Ukraine. (AP Photo/Sean Dempsey, Pool)

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Russian Foreign Minister Sergey Lavrov speaks at a press conference at the Russian Ambassador's residence in London, Friday, March 14, 2014. Russian Foreign Minister Sergey Lavrov spoke following a meeting with US Secretary of State John Kerry. (AP Photo/Kirsty Wigglesworth)